Assigbtoe



C. S. LINCOLN. PULVERIZER. mwucmom man JULY 1. i916.

Patented July 15, 1919.

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- discharge grid or ,qrate'which" is simple in construction and eflicient in operation,

One of the morespecifichbjects; is to provide a simple and efiicient grate bar, which when excessively Worn pn one'jaside, may be readily reversed and further; utilized "by exposing another side thereof as Wear. Another specific obj ect: is :to provide a spacing element for the grate harsof discharge grids, which is simple in construetionand which will permit ready insertion; removal and reversal of the bars. A further specific object *is to provide otherdetailsof construction ofg'rids or grates which. will reduce the cost of construction and of maintenance to a minimum.- 4

In applying this invention it is-preferable to utilize standard rectangular.;:sectioned bars of very hard materiah such as tool steel, the bars being merely cut intozsuitable lengths by transverse sawing along'a single plane, without reducing the cross'section of the bars at any point throughout their lengths. ,The bars afterbeingzisawed' into suitable lengths are provided with recesses; adjacent their= gends. Whilez-theseorecesses have been disclosed as 'througlriopeni-ngs it is apparent that the same :may takevvarious other forms. Spacing elementsW-hich are preferably caster otherwise formed in vone piece and providedwithintegral projections or lugs engageable with the recesses of the adjacent bars, are insertibleibetween a djw cent ends of successive bars and are constrncted to permit ready reversal ofthe bars. A clear conception of an embodiment-of ence characters designate the same or simii lar parts in the various viewsJ F igure 1 is a transverse vertical section WHWQM'; f= v.-' i .3. t. I specification n Lettiirs new." Patented .itayis, rare.- .e neaticnaieuui i,1916. -Seria1fio.107,478.

Pulverizers,

prfnrtwncnn Wiscons n; a, conronnr on on through an impact pulverizerhaving the invention applied thereto. -.-i :,Fig.-2 is an enlarged transverse vertical section-through a fragment of the pnlverizer grate,=showing the same applied-to a frag ment of the pulverizer casing. i v

Fig. 3'is a side elevation of one of the spacing elements. a Fig. 4 is an endelevation otone of the spacing elements looking" toward the retaininglu'gsthereof. v

. Fig.f5 is a fragmentaryisideelevation; of

one ofthe grate'bars. I The pulverizer housing. comprises a maincasing lst'orming a pulvenizing chamber 1 L 7 and provided withinleta-nd discharge pair sages: or. openings 5-, 8,: respectivel The main shaft 2 is rotatably mounted in suitable side bearings of the casing -1, and has secured thereto a rotor comprising a suspen-.

sion element- 3 and. a series of revolnble beaters'i'. The upper and'Side portions 01" the casing 1 adjacent the path of the heaters 7, are provided with suitable liners 9;;While the lower portion of the casing 1 adjacent the-dischargeopening 8 is provided With agrid or grate comprising -;a series ohgrate bars 6.- 1- w i v r The grate bars 6 are formed. of standard bar Sectionwmaterial of rectangular cross section,'l and are preferably cut squareet the ends, esindicated in- Fig; 5. The end por-. tions 'of the barsG are provided with're- OQSSGS'ifOKIDGd' as transverse through open ings 12,: and normally engage? curved side recesses 13 in the casing 1. Thebars 6 are also preferably formedot' a suitable-Wear resisting materiaL-suchxas tool steel, which; is commercially obtainable at reasonable cost in rectangular sectioned bar-form. Between adjacent-ends of the successive grate bais 6:

ofthe assembled grate, are placed spacing elements 10, having; laterally prO eCting lugs" ll extending from one side-"thereof. wThese spacing-- elements 10 ttlezfOllfieCl of suitable thickness detennined bythc desired-i size of the product discharged from the pulverizer, and are forr'ned wedge'shape'd or'taperedin order to position the grate bars 6 substantially radially, as indicated in Figs. 1 and 2. The spacing elements 10 are preferably formed out of any suitable material, by casting or drop forging, and require little or no finishing.

During the normal operation of the pul veri zer the material to be reduced is admittcdto,tlietpulverizing chamher ithrough h inlet pen ng 51, i irecjh h efiby pact with "the "revolvi g haiiir'iiersbr be'nters 7 and with the adjacent liners 9. When the, material has been reduced suiiiciently to. Pe m pa age. re t th h th slots between successive grate liars 6 of the discharge grid, the reduced inate'rial is delivered from the pulverizer through the dischargeopeningS. I

When the bars 6 become wornjjaiiongthe edges thereof which are exposed to thepulverizing chamber, to such an *extent that the uniformity of the discharged material is materially affected, the worn hers may he removed from the recesses 13 by removal of one or more of the liners Qedjadent theend of the grate, and re-"inserted in therecesses 13 in reverse position. Theedjecent spacing elements 10 are formedto' readily permit such reversal of the bars 6, by'hevi'ng the lugs 11 located equidistant from: the endsthereof. The ba-rs when 'so' reversed again furnish suitable *wearing'surfaces and maintain='the-'desired uniformityend sine of; the-product delivered from the machine.

By utilizing rectangular sectionor other commercial form of bar tool steeliifor the construction of the bars, the cost; o f manufacture and of Tnaintenahce are reduced to a minimum. 'The reversibility of the -hers extends the life thereof, thereby further re duc'ing the-cost of maintenancs'of; the pulverizerl By maintaining'the' fihars of uniform cross section throughout. their length, bars of uniform strength are attained and the cost of manufactuieis re duced toa minimum, as the construction of the bars is accomplished by sewing them from the bar stock. The formation of the recesses or holes 12in the-ends of the here may be readily accomplished by drilling. These provide simple' and efficient means for'reteining the spacing eiem'ents 10 in position. 1

The spacing elements 10' may 'hefformed of any suitable materia'l end'requiie iittle or no finishing. "By making thespaeingsele merits 1O independentof the adj aeent bars 6, these elements may he reedilyremoved and' new ones of difi'erent thickness inserted,

in' case it is desirable to vary the sizeof the product discharged. As the spacing elements are loceted entirely vvithin'the sisters-- cesse's 13, they are not subjected "to any conadjacent bars ,6.

sired to be limited to the siderahle and therefore be used indefinitely, irrespective of reneyval the It should 'he understood tli; is not deconstruction shown and described, for obvious modifications will occur to a person skilled in. the art. k

" Itis claimeda'nd desired to secure by Letters Patent I 1. As an article of manufacture, a spacing. block for grate bars, having a pair-of retaining lugs spaced equidistant from its opposite ends.

' 2. In combination, a series of grate bars each having a pair of recessesadjacent "an end thereof, and a. spacing-element between adjacent :endsof successive burs, sai-d'element having retainingl'ugs engageable with said recesses of either of said adjacent bars.

3. In combination, 'a rectangular-sectioned grate bar having a pair of'recessesadjacent an endyand' a spacing-"block having lateral projections reversibly engageable in said recessesg a 4. As an articleofmanufa'cture, a specing bloclc'for grate bars, having a pair of retaining iugs projecting from one side thereof and spaced equidistant from its-flop posits ends. I

'5. As an articleof'manu'facture', a tapered spacing block for grate bars, having a pair of retaining lugs spaced equidistant from its opposite ends in the direction of tlietaper.

"6. Iii-combination, a spacing element havbetween adjacent ends of successive bars,

said element having retaininglugs engageable with said recesses." 2

In testimony whereof the signature of the;

inven'wi S aiiixed hereto.

CHARLESS; LINCOLN. 

